Devil May Cry walkthrough/SM09

Return to the room with the biplane after you defeat Nightmare in Mission 16.

Walkthrough
To complete this secret mission, you have to first flush each Shadow out of hiding, then kill it. I know what you're saying: "But I don't want to fight any more Shadows!". Well, buck up and get it done like the Devil Hunter you are.

There are two shadows hiding on the wings of the airplane. The third is in the entryway, in the hollow to the left of the statue of Mundus, (the same place where you found the Blue Orb fragment.) The final Shadow is outside, by the bridge.
 * If anyone has more accurate descriptions of where to find the Shadows, please add them!